US7020123B2 - Method and apparatus for transmitting and receiving wireless packet - Google Patents
Method and apparatus for transmitting and receiving wireless packet Download PDFInfo
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- US7020123B2 US7020123B2 US09/783,129 US78312901A US7020123B2 US 7020123 B2 US7020123 B2 US 7020123B2 US 78312901 A US78312901 A US 78312901A US 7020123 B2 US7020123 B2 US 7020123B2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/005—Control of transmission; Equalising
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0072—Error control for data other than payload data, e.g. control data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
Definitions
- the present invention relates to a radio transmitting/receiving system. More particularly, the present invention relates to a wireless packetization apparatus for transmitting and/or receiving multimedia data including video data in a radio transmitting/receiving system, and a method thereof.
- a radio transmitter and a radio receiver employing a phase 1 standard in CDMA 2000 are formed of high-level layers as shown in FIG. 1 .
- Codec-related standards such as H.324M. H.323, and T.120 correspond to an application layer.
- the physical layer performs channel coding, PN spreading, and modulation.
- the media access control (MAC) layer includes a signaling unit (not shown) and a radio link protocol (hereinafter referred to as RLP) (not shown), and the RLP converts payload on the application layer transmitted through a radio path into an input format on the physical layer.
- the physical layer among the three layers is mainly realized by hardware, thereby reducing its flexibility when its hardware is determined by a standard. However, flexibility can be given to the application layer considering its network-independent portion.
- one RLP corresponds to each of a number N of applications (application 1 , application 2 , . . . , and application N).
- the RLP is connected to a physical layer 240 through a multiplex (MUX) sub-layer 230 .
- MUX multiplex
- the MUX sub-layer 230 multiplexes a number N of received RLPs adaptively to a protocol data unit (PDU).
- PDU protocol data unit
- a multiplex-protocol data unit (MUX-PDU) is available in a case where a channel bit error rate is less than 10 ⁇ 6.
- reference numeral 310 denotes a service reference identification (ID)
- reference numeral 320 denotes an arbitrary user region
- reference numeral 330 denotes payload, which is received from an application layer.
- a wireless packetization method in a radio transmitting and receiving system for transmitting and/or receiving multimedia data in a wireless environment.
- the method comprises the steps of: dividing multimedia data-related header information into one portion and a plurality of portions, respectively; and adding error checking or protection codes to each of the divided header information.
- a wireless packetization method in a radio transmitting and receiving system for transmitting and/or receiving multimedia data in a wireless environment.
- the method comprises the steps of: adding a length field for indicating the length of data in a data region and a length indicator field for identifying the length of the length field on a multiplex (MUX) layer where the multimedia data is multiplexed into predetermined units of header information.
- MUX multiplex
- a wireless packetization method in a radio transmitting and receiving system for transmitting and/or receiving multimedia data in a wireless environment.
- the method comprises the steps of: adding a length field for indicating the length of data in a data region and a length indicator field for identifying the length of the length field on a multiplex (MUX) layer where the multimedia data is multiplexed into predetermined units of header information; and forming a predetermined protocol frame by adding error checking or protection codes to each of the length field and the length indicator field.
- MUX multiplex
- a wireless packetization apparatus in a radio transmitting apparatus for transmitting multimedia data on a multiplex (MUX) sub-layer in a wireless environment.
- the apparatus includes a header information-creating unit for creating a first field which indicates the number of potential bits of the length of data and a second field indicating the length of the data and for adding error protection codes to each of the header information which is divided into one portion and a plurality of portions, respectively, and a frame-forming unit for forming a frame having the unit of protocol data by multiplexing the header information formed in the header information-creating unit and the data.
- a method for decoding a wireless packet by receiving a packet in which error protection codes are added to one portion and a plurality of portions of the header information, respectively, on a wireless multiplex (MUX) sub-layer in a multimedia data transmitting system.
- the method comprises the steps of: (1) discarding the previous frame in a case where there is some error and checking a second error protection code added to the next header information portion in a case where there is no error, when a first error protection code added to the initial header information is checked; and (2) transmitting data to an upper layer in a case where there is no error and transmitting a blank data block to the upper layer in a case where there is some error, when the second error protection code is checked.
- an apparatus for receiving a wireless packet in an apparatus for decoding data by receiving a packet in which error protection codes are added to one portion and a plurality of portions of the header information, respectively, on a wireless multiplex (MUX) sub-layer in a multimedia data transmitting system.
- MUX wireless multiplex
- the apparatus includes (1) a means for discarding the previous frame in a case where there is some error and checking a second error protection code added to the next header information portion in a case where there is no error, when a first error protection code added to the initial header information is checked, and (2) a means for transmitting data to an upper layer in a case where there is no error and transmitting a blank data block to the upper layer in a case where there is some error, when the second error protection code is checked.
- FIG. 1 is a block diagram of a conventional radio transmitter/receiver employing a phase 1 in CDMA 2000.
- FIG. 2 is a block diagram which illustrates relations between RLP and a MUX sub-layer.
- FIG. 3 is a format diagram of a frame of MUX-PDU type 3 in CDMA version 2000.
- FIG. 4 is a conceptual diagram of MUX-PDU framing according to the present invention.
- FIG. 5 is a flow chart illustrating a method for encoding the MUX-PDU framing according to the present invention.
- FIG. 6 is a format diagram of a new MUX-PDU frame according to the present invention.
- FIG. 7 is a flow chart illustrating a preferred embodiment for decoding the encoded MUX-PDU frame.
- a header information-creating unit 410 denotes a SR_ID field for indicating a service reference identification (ID). It alsocreates a length indicator field for identifying the length field and a length field for indicating the length of the data.
- the header information-creating unit 410 divides header information into one portion and a plurality of portions, respectively, and adds error protection codes to each of the divided header information.
- a MUX-PDU frame-forming unit 420 forms a MUX-PDU frame by multiplexing header information formed in the header information-creating unit 410 and payload.
- video and audio data which are generated from an application layer, are transmitted to a MUX sub-layer through a RLP layer (step 510 ).
- the MUX sub-layer creates a SR_ID field for indicating a service reference identification (ID) and a Reserved field for indicating an arbitrary user region (step 520 ).
- the MUX sub-layer creates a Length field for indicating the length of data and a Length Indicator field for identifying the length of the Length field, and adds the length indicator field and the length field to the header information (step 530 ).
- the MUX sub-layer (1) creates a first cyclic redundancy code (CRC 1 ) and a second cyclic redundancy code (CRC 2 ), which correspond to error detection codes, by checksumming bits of each of the Length Indicator field and the Length field, and (2) adds CRC 1 and CRC 2 to the Length Indicator field and the Length field (step 540 ).
- CRC 1 cyclic redundancy code
- CRC 2 second cyclic redundancy code
- the MUX sub-layer forms a MUX-PDU frame of payload and header information including the SR_ID field, the Reserved field, the Length Indicator field, the first CRC field (CRC 1 ), the Length field, and the second CRC field (CRC 2 ) (step 550 ).
- a MUX-PDU frame shown in FIG. 6 is formed of a header portion comprising a SR_ID field 610 , a Reserved field 620 , a Length Indicator field 630 , a first CRC field (CRC 1 ) 640 , a Length field 650 , a second CRC field (CRC 2 ) 660 and a DATA field 670 .
- the Length Indicator field 630 and the Length field 650 are added to the SR_ID field 610 and the Reserved field 620 , which are contained in the conventional header (see FIG. 3 ).
- the first CRC field (CRC 1 ) 640 for error-protecting the SR_ID field 610 , the Reserved field 620 , and the Length Indicator 630 are added to the Length Indicator field 630
- a second CRC field (CRC 2 ) 660 for error-protecting the Length field 650 is added to the Length field 650 .
- the Length Indicator field 630 is comprised of three potential sizes of Length field 650 , that is, 2 bits for indicating “0”, “1 ⁇ 2 16 ⁇ 1”, and “2 16 ⁇ 2 32 ⁇ 1”.
- the Length field 650 is indicated as one of 0, 16, 32 bits.
- the first CRC field 640 is calculated by checksumming the bits of the SR-ID field 610 , the Reserved field 620 , and the Length Indicator field 630 and is preferably comprised of 4 bits.
- the second CRC field 650 is calculated by checksumming the bits of the Length Indicator field 630 and is preferably comprised of one of 0 or 8 bits.
- a polynomial operator p(x) for the CRC of the specific length.
- a receiver performs error-checking, because error protection codes are added to one portion and a plurality of portions of the header information in a packet received through a radio channel, respectively (step 710 ). That is, the receiver checks a first CRC 640 on a DeMUX sub-layer (steps 720 and 730 ), and when there is some error, the previous frame is discarded (step 770 ). If there is no error, a second CRC 660 is checked (step 740 ).
- the receiver checks the second CRC 660 on the DeMUX sub-layer (steps 740 ) and when there is no error (step 750 ), data is transmitted to an upper layer (step 760 ), but if there is some error (step 750 ), a blank data block is transmitted to the upper layer (step 780 ).
- the Length Indicator field 630 and the Length field 650 are error-checked by the first CRC 640 and the second CRC 660 , and even though there is some error during their transmission, the reliability of the length of the data is increased.
- the above encoding and decoding methods can be embodied in a computer program. Codes and code segments encompassing the program can be easily inferred by a skilled computer programmer in the art. Also, the program can be realized in media used in a computer and in a common digital computer for operating the program. The program can be stored in computer readable media. The media can include magnetic media such as a floppy disk or a hard disk and optical media such as a CD-ROM or a digital video disc (DVD). Also, the program can be transmitted by carrier waves such as the Internet.
- error resilience can be increased by adding error protection codes to one portion and a plurality of portions of the header information in MUX-PDU, respectively, when multimedia data such as video data requiring real time or low delay are transmitted and received in a wireless environment, and a packet drop rate can thereby be reduced.
- the reliability of the length of an information region is increased by inserting length identifier and length information on an information region into the header.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Error Detection And Correction (AREA)
- Mobile Radio Communication Systems (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Small-Scale Networks (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/783,129 US7020123B2 (en) | 2000-03-29 | 2001-02-15 | Method and apparatus for transmitting and receiving wireless packet |
Applications Claiming Priority (4)
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US19288300P | 2000-03-29 | 2000-03-29 | |
KR00-24210 | 2000-05-06 | ||
KR1020000024210A KR100657253B1 (ko) | 2000-03-29 | 2000-05-06 | 무선 패킷 송수신 장치 및 그 방법 |
US09/783,129 US7020123B2 (en) | 2000-03-29 | 2001-02-15 | Method and apparatus for transmitting and receiving wireless packet |
Publications (2)
Publication Number | Publication Date |
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US20020036993A1 US20020036993A1 (en) | 2002-03-28 |
US7020123B2 true US7020123B2 (en) | 2006-03-28 |
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US09/783,129 Expired - Lifetime US7020123B2 (en) | 2000-03-29 | 2001-02-15 | Method and apparatus for transmitting and receiving wireless packet |
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US (1) | US7020123B2 (pt) |
EP (1) | EP1181784B1 (pt) |
JP (1) | JP3669961B2 (pt) |
KR (1) | KR100657253B1 (pt) |
CN (1) | CN100421361C (pt) |
AU (1) | AU766114B2 (pt) |
BR (1) | BRPI0010974B1 (pt) |
CA (1) | CA2375393C (pt) |
RU (1) | RU2216861C2 (pt) |
WO (1) | WO2001073974A1 (pt) |
Cited By (9)
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US20040090992A1 (en) * | 2002-10-29 | 2004-05-13 | Lg Electronics Inc. | Simultaneous voice and data service in mobile communication system |
US20050086571A1 (en) * | 2003-10-03 | 2005-04-21 | Farnsworth Timothy L. | Data processing system and method |
US20060181513A1 (en) * | 2004-12-31 | 2006-08-17 | Bi-Hui Lin | Method And Related Apparatus For Decreasing Delay Time |
US20070047574A1 (en) * | 2005-08-24 | 2007-03-01 | Fan Ling | Transmission of multiplex protocol data units in physical layer packets |
US20070250637A1 (en) * | 2005-04-29 | 2007-10-25 | Sam Shiaw-Shiang Jiang | Method and Apparatus for Reducing Jitter in a Receiver of a Selective Combining System |
US20070277079A1 (en) * | 2004-08-20 | 2007-11-29 | Frank Hofmann | Method For Error Correction Of Program-Associated Data |
US20080282131A1 (en) * | 2001-12-05 | 2008-11-13 | Lg Electronics Inc. | Error detection code generating method and error detection code generator |
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US8320262B2 (en) | 2002-04-15 | 2012-11-27 | Robert Bosch Gmbh | Bus system and method and device for transmitting communications on a bus system |
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KR100434335B1 (ko) * | 2001-11-27 | 2004-06-04 | 학교법인 한국정보통신학원 | 광 버스트 스위칭 네트워크의 제어패킷과 데이터 버스트생성방법 |
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CN101136722B (zh) * | 2007-10-15 | 2010-08-11 | 北京交通大学 | 一种适用于高速移动终端的数据发送方法及传输设备 |
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US20100086087A1 (en) * | 2008-10-02 | 2010-04-08 | Nokia Corporation | Transmission Enhancements for Physical Layer Transmission |
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Also Published As
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RU2216861C2 (ru) | 2003-11-20 |
JP3669961B2 (ja) | 2005-07-13 |
EP1181784A4 (en) | 2007-10-03 |
CN100421361C (zh) | 2008-09-24 |
US20020036993A1 (en) | 2002-03-28 |
KR20010093614A (ko) | 2001-10-29 |
WO2001073974A1 (en) | 2001-10-04 |
AU766114B2 (en) | 2003-10-09 |
EP1181784A1 (en) | 2002-02-27 |
JP2003529278A (ja) | 2003-09-30 |
CA2375393C (en) | 2006-07-25 |
EP1181784B1 (en) | 2018-03-28 |
CA2375393A1 (en) | 2001-10-04 |
BRPI0010974B1 (pt) | 2015-08-25 |
CN1360763A (zh) | 2002-07-24 |
AU2409601A (en) | 2001-10-08 |
BR0010974A (pt) | 2002-03-05 |
KR100657253B1 (ko) | 2006-12-14 |
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